The question to TLD developers. In campaign.txt ( for Classic CC5 ) I set up "0" in the line "Recycle Disbanded BGs (0 = Never come back, 1 = Return next day)". But in the game disbanded BG appeared again. So is it bug or this setting doesn't work in Classic CC5 ?

We've not had any other reports of this so my inclination is to say it's something specific to your build. Have you done any other modding? Have you had any mods installed since creating this installation your using?